125447689 has 2 divisors, whose sum is σ = 125447690. Its totient is φ = 125447688.

The previous prime is 125447687. The next prime is 125447711. The reversal of 125447689 is 986744521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97357689 + 28090000 = 9867^2 + 5300^2 .

It is a cyclic number.

It is not a de Polignac number, because 125447689 - 2¹ = 125447687 is a prime.

Together with 125447687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (125447683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62723844 + 62723845.

It is an arithmetic number, because the mean of its divisors is an integer number (62723845).

Almost surely, 2^125447689 is an apocalyptic number.

It is an amenable number.

125447689 is a deficient number, since it is larger than the sum of its proper divisors (1).

125447689 is an equidigital number, since it uses as much as digits as its factorization.

125447689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 46.

The square root of 125447689 is about 11200.3432536686. The cubic root of 125447689 is about 500.5962074574.

The spelling of 125447689 in words is "one hundred twenty-five million, four hundred forty-seven thousand, six hundred eighty-nine".